# IB Security 2019

Instructions

For the following questions answer them individually

Question 1

What are the Highest Common Factor and Lowest Common Multiple of 6, 72, 120?

Question 2

If a quadratic polynomial y = $$ax^2+ bx + c$$ intersects x axis at α and β, then

Question 3

If in two linear equations ax + by = c and dx + ey = f and a/d = b/e = c/f then, which of the following is true about the two equations?

Question 4

Roots of the quadratic equations $$2x^2 + x - 528$$ = 0 is:

Question 5

Sum of all positive integers from 1 to 100 is:

Question 6

If area of similar triangles Δ ABC and Δ DEF be 64 sq cm and 121 sq cm and EF = 15.4 cm then BC equals:

Question 7

Area of a triangle with vertices at (2, 3), (-1, 0) and (2, -4) is:

Question 8

2 × tan 30° / $$(1 + tan^2 30°)$$ equals:

Question 9

The angle of elevation of the top of a tower from a point on ground which is 30 mtrs. away from the foot of the tower is 30°. Height of the tower is:

Question 10

The length of a tangent from a point A at a distance 5 cm from the centre of the circle is 4 cms. Radius of the circle is

OR